522 Journal of Applied Microscopy. 



are carefully selected, and the directions for their execution clearly and con- 

 cisely given. 



The next chapter is given up to a consideration of the complex group of 

 nitrogen-containing bodies, variously designated by different authors, but which 

 the author calls " Proteins." After giving the classification of the proteins, 

 essentially that of Wroblewski, the individuals of the classes are considered, 

 together with the various reactions by which they are separated and identified. 



We would take exception to the following statement : " In icteric conditions, 

 the saliva does not contain bile constituents." The investigations of Fenwick 

 prove the presence of bile pigments in the saliva in certain diseases. 



The section on " Gastric Juice " is quite exhaustive and valuable. We believe, 

 however, that it would have been improved if a few experiments on the action 

 of formic aldehyde on proteins, and the difficult digestibility of the formalde- 

 hyde-proteids had been added. This would be of especial value, as the use of 

 formaldehyde as a preservative for milk seems to be on the increase. 



Again, in the chapter devoted to milk, the experiments are well selected, but 

 the addition of a few qualitative tests for the presence of some of the common 

 preservative agents would have increased its value very much. 



Chapter XI is devoted to quantitative analysis, and gives the student a 

 very clear and concise, though brief, outline of so much quantitative analysis as 

 may be necessary for medical students. 



The volume closes with an excellent table for the examination of urine, and 

 some good plates of urinary sediments. 



On the whole, the work is clear and concise, and still sufficiently ample to 



impart an excellent working knowledge to the medical student. We can most 



heartily recommend it to the careful consideration of teachers of chemistry in 



the medical schools of the country. 



John A. Miller, Ph. D. 

 Berlin. 



u „„.. jT,. T^.., r -n Professor Jordan is to be thanked by 



nueppe, Dr. Ferdinand. The Principles of Bac- ■' ■' 



teriology. Translated by E. O. Jordan, American bacteriologists for putting 

 University of Chicago, pp. 455- The Open -^^^^ ^ig^j. English this work of Dr. 

 Court Publishing Co. ° 



Hueppe. The work is more than a 



simple outline of the principles of bacteriology, since it contains an exposition of 



certain aspects of this subject that do not commonly receive treatment. Dr. 



Hueppe's views upon certain phases of bacteriological problems are in some 



respects peculiar. In this work he places himself in opposition to the school of 



Koch in regard to the relation of bacteria to the problem of the cause of disease. 



In the first three chapters he gives a general account of bacteria, the vital 

 phenomena connected with their life, and a description of the most important 

 pathogenic bacteria. The chapter upon the vital properties of these organisms 

 is especially important, containing valuable information concerning the chemistry 

 of bacteriological foods and poisons. 



It is in the following chapters upon the cause of infectious disease, and 

 kindred subjects, that the suggestive part of the work begins. In brief, Dr. 

 Hueppe denies the idea that " specific " bacteria are the cause of specific 



